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ffmpeg -i "$(find ~/.mozilla -regex '.*Cache.*' -a -not -regex \
> '.*_CACHE_.*' -printf '%T+ %p\n' | \
> sort -n | awk '{ print $2 }' | xargs file | \
> grep -i "Video" | tail -1 | awk -F : '{ print $1 }')" \
> -vcodec msmpeg4v2 -b 200 -ab 64 -ar 22050 -s 320x240 \
> /home/halbert/xp.mpg
FFmpeg version SVN-rUNKNOWN, Copyright (c) 2000-2007 Fabrice Bellard, et al.
  configuration: --enable-gpl --enable-pp --enable-swscaler --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libogg --enable-libgsm --enable-dc1394 --disable-debug --enable-shared --prefix=/usr
  libavutil version: 1d.49.3.0
  libavcodec version: 1d.51.38.0
  libavformat version: 1d.51.10.0
  built on Jun  3 2007 20:59:25, gcc: 4.1.3 20070528 (prerelease) (Ubuntu 4.1.2-9ubuntu2)

Seems stream 0 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 12.00 (12/1)
Input #0, flv, from '/root/.mozilla/firefox/jqu1modj.default/Cache/B129B34Fd01':
  Duration: 01:30:32.0, start: 0.000000, bitrate: 64 kb/s
  Stream #0.0: Video: flv, yuv420p, 540x408, 12.00 fps(r)
  Stream #0.1: Audio: mp3, 22050 Hz, mono, 64 kb/s
File '/home/halbert/xp.mpg' already exists. Overwrite ? [y/N] y
Output #0, mpeg, to '/home/halbert/xp.mpg':
  Stream #0.0: Video: msmpeg4v2, yuv420p, 320x240, q=2-31, 0 kb/s, 12.00 fps(c)
  Stream #0.1: Audio: mp2, 22050 Hz, mono, 0 kb/s
Stream mapping:
  Stream #0.0 -> #0.0
  Stream #0.1 -> #0.1
Press [q] to stop encoding
[flv @ 0xb7e9bac8]run overflow at 12x9 i:05 bitrate=   0.0kbits/s    
[flv @ 0xb7e9bac8]Error at MB: 327
[flv @ 0xb7e9bac8]concealing 621 DC, 621 AC, 621 MV errors
frame=  114 q=31.0 Lsize=      32kB time=9.4 bitrate=  27.9kbits/s    
video:26kB audio:2kB global headers:0kB muxing overhead 12.111674%